/* ===== 左侧分类导览 ===== */
.art-type-leftnav {
  display: none;
  width: 148px;
  flex-shrink: 0;
  background: var(--bg-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  align-self: flex-start;
  position: sticky;
  top: 12px;
}

.aln-item {
  display: block;
  padding: 11px 14px;
  font-size: 13px;
  color: var(--text-light);
  border-bottom: 1px solid var(--border);
  transition: color 0.15s, background 0.15s;
}
.aln-item:last-child { border-bottom: none; }
.aln-item:hover { color: var(--accent); background: #fafafa; }
.aln-item.active {
  color: var(--accent);
  font-weight: 600;
  background: var(--accent-light);
  border-left: 3px solid var(--accent);
  padding-left: 13px;
}

@media (min-width: 768px) {
  .art-type-leftnav { display: block; }
}